this isn’t just an academic curiosity. flip the alternation order to (ab|a)+ and suddenly PCRE matches the entire string! the | operator in backtracking engines is ordered - it’s not union, it’s “try left first”. the order of branches changes the result, which means | is not commutative. a|b and b|a can give different matches.
Зеленский решил отправить военных на Ближний Восток20:58，详情可参考体育直播
。业内人士推荐必应排名_Bing SEO_先做后付作为进阶阅读
在米兰—科尔蒂纳冬奥会赛场周边，体育用品店货架上摆满了各类冰雪装备。拿起一根为滑雪运动新手准备的滑雪杖，“Made in China”几个英文单词引人注意。这根运动杖的“出生地”是浙江省宁波市宁海县，每年超过1500万根运动杖从这里出发，销往世界各地。
Путешествия для россиян стали еще дороже из-за конфликта на Ближнем Востоке20:37，这一点在旺商聊官方下载中也有详细论述